M-Weight Calculator

Measure M-weight (the weight of 1,000 sheets of paper) by providing the sheet size, basis weight, and basic size of the paper. When filling in these fields, use decimal fractions where necessary and give lengths in inches and weight in pounds.

M-Weight Calculator

Given Sheet Size:(length × width)

length

width

Basis Weight:

lbs.

Select…

(Or type in values below.)

Basic Size:(height × width)

height

width

M-weight =

lbs.

The numerical results from this calculator are estimates only and are not guaranteed. Individual mills may use slightly different methods of calculating M-weight. Also, certain products—particularly higher-caliper SBS and recycled board—can vary dramatically in basis weight (and therefore M-weight). Lastly, actual selling M-weight may be calculated on the full width of the roll (i.e., size plus waste), thereby increasing the M-weight amount. Please call your sales representative to confirm M-weight.

Example

Find the M-weight for a sheet of 11″ × 17″ book paper with a basis weight of 70 lbs.

Formula:

Equation:

(11 × 17) × 70

(25 × 38)

=

13.78 × 2

=

27.56

Note that in this example, the area of the given sheet size is 11 × 17 = 187 inches2 (i.e., less than 336 inches2), according to the M-weight rounding rules below, ream weight should be rounded to the nearest hundredth of a pound.

Specifications

M-Weight Rounding Rules

Sheet Size

Ream Weights

864 inches2 >

Ream weight calculated to nearest pound, e.g.: 148 lbs.

336 – 864 inches2

Ream weight calculated to nearest half pound, e.g.: 148.5 lbs.

< 336 inches2

Ream weight calculated to nearest one hundredth of a pound, e.g.: 148.57 lbs.

Terms & Definitions

Ream: 500 sheets of paper cut to a given standard size for a particular grade.